Cannot send files bigger then 256kb to service bus via amqps

We are routing messages to service bus. And getting error when trying to send messages bigger then 256kb.
Error{condition=message-size-exceeded,description=The received message (delivery-id:0, size:327565 bytes) exceeds the limit (262144 bytes) currently allowed on the link.}
And also exception saying that link has been detached.
Is this message soming from service bus or from camel framework? And how can I solve it?
Thanks